Colour is a powerful tool that is tied to religious, cultural, political and social influences. It can affect mood, communicate messages, and carry cultural and political associations. There are primary, secondary, and tertiary colours. Complementary colours are opposites on a colour wheel and can create harmony, while analogous colours are groups of three colours. Different colours have common meanings and associations like red being dynamic and warm colours being inviting. Colour is an important part of visual communication and expression across cultures.